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Spectral Averaging
: You can turn on averaging in the frequency domain for phase and
magnitude waveforms.
Multiple Analyzer Control Locks
: Up to four spectral analyzers can be used simultaneously.
They can all be assigned to different gates on the same source waveform or to different
channel sources. The controls of Math1 and Math2 can be locked, and the controls of Math3
and Math4 can be locked. When controls are locked, turning a control on one analyzer
changes the control on the other analyzer to the same value. Other combinations of locking,
including all four analyzers, are available using GPIB commands.
The same exclusions for math waveforms apply to spectral math waveforms. In addition, sources
for spectral math waveforms must be channel waveforms.
Using the Spectral Math Controls
The spectral analyzer contains five primary control categories. These are shown in the table below.
Click one of the links for more information on using each type of control.
Time controls Gate controls
Frequency
controls
Magnitude
controls
Phase
controls
Source Position Center dB,
dBm
linear, real
imaginary
degrees,
radians, group
delay
Duration,
record length
Duration
Span
Ref level
Zero threshold
Duration,
sample rate
Window Resolution
bandwidth
Ref level
offset
Phase Unwrap
Resolution
Using the Time Controls
The operation of the time domain controls for the spectral analyzer is summarized by the
following rules:
Duration selects the time from the beginning to the end of the acquired waveform. You may
set duration using the record length control or the sample rate control.
Resolution determines the time between samples. Duration is kept constant as resolution is
changed. Therefore, the Resolution control affects both the sample rate and the record length
simultaneously.
Most often, you will want to use a short record length because long record lengths can slow
instrument response. However, long record lengths lower the noise relative to the signal and
increase the frequency resolution for the spectral math waveform. More importantly, they
might be needed to capture the waveform feature that you want to include in the waveform.
Summary of Contents for TDS5000B Series
Page 36: ...36 AFTDS Differential Signal Adapter...
Page 280: ...280 Blackman Harris window...
